/usr/include/QtGStreamer/QGlib/type.h is in libqtgstreamer-dev 1.2.0-3.
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Copyright (C) 2009-2010 George Kiagiadakis <kiagiadakis.george@gmail.com>
Copyright (C) 2010 Collabora Ltd.
@author George Kiagiadakis <george.kiagiadakis@collabora.co.uk>
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QGLIB_TYPE_H
#define QGLIB_TYPE_H
#include "global.h"
#include <QtCore/QList>
#include <boost/mpl/if.hpp>
/*
* This is a re-definition of GType inside the QGlib::Private namespace.
* It is used in the headers to avoid including <glib-object.h>.
*
* According to gtype.h, GType is ulong in C++ for historic reasons,
* but only if sizeof(size_t) == sizeof(ulong). This template trick
* here attempts to express the same logic wigh C++ templates.
*/
namespace QGlib {
namespace Private {
typedef boost::mpl::if_c<
sizeof(size_t) == sizeof(unsigned long),
unsigned long,
QIntegerForSizeof<size_t>::Unsigned
>::type GType;
} //namespace Private
} //namespace QGlib
namespace QGlib { //closing and re-opening namespace QGlib is required to trick codegen
/*! \headerfile type.h <QGlib/Type>
* \brief Wrapper class for GType
*
* A GType is a numerical value which represents the unique identifier
* of a registered type. The GType API is the foundation of the GObject system.
* It provides the facilities for registering and managing all fundamental data types,
* user-defined object and interface types.
*
* As a wrapper, this class provides only methods for querying existing types,
* not registering new ones. You should never need to use it directly, although
* it might come in handy in some cases.
*
* To retrieve a Type for a certain class, use GetType().
*
* \note This class is a thin wrapper around an unsigned long. There is no overhead
* in copying it around, since it is just an integer.
*/
class QTGLIB_EXPORT Type
{
public:
enum FundamentalType {
Invalid = 0,
None = 1<<2,
Interface = 2<<2,
Char = 3<<2,
Uchar = 4<<2,
Boolean = 5<<2,
Int = 6<<2,
Uint = 7<<2,
Long = 8<<2,
Ulong = 9<<2,
Int64 = 10<<2,
Uint64 = 11<<2,
Enum = 12<<2,
Flags = 13<<2,
Float = 14<<2,
Double = 15<<2,
String = 16<<2,
Pointer = 17<<2,
Boxed = 18<<2,
Param = 19<<2,
Object = 20<<2
};
inline Type() : m_type(0) {}
inline Type(Private::GType gtype) : m_type(gtype) {}
inline Type(FundamentalType ftype) : m_type(ftype) {}
inline Type(const Type & other) : m_type(other.m_type) {}
inline Type & operator=(Type other);
inline bool operator==(Type other) const;
inline operator Private::GType() const { return m_type; }
static Type fromInstance(void *nativeInstance);
static Type fromName(const char *name);
QString name() const;
Quark nameQuark() const;
bool isValid() const;
bool isAbstract() const;
bool isDerived() const;
bool isFundamental() const;
bool isValueType() const;
bool hasValueTable() const;
bool isClassed() const;
bool isInstantiatable() const;
bool isDerivable() const;
bool isDeepDerivable() const;
bool isInterface() const;
Type fundamental() const;
Type parent() const;
uint depth() const;
Type nextBase(Type rootType) const;
bool isA(Type is_a_type) const;
template <typename T>
inline bool isA() const;
QList<Type> children() const;
QList<Type> interfaces() const;
QList<Type> interfacePrerequisites() const;
void *quarkData(const Quark & qname) const;
void setQuarkData(const Quark & qname, void *data);
private:
Private::GType m_type;
};
inline Type & Type::operator=(Type other)
{
m_type = other.m_type;
return *this;
}
inline bool Type::operator==(Type other) const
{
return m_type == other.m_type;
}
template <class T>
inline Type GetType(); //forward-declaration, defined below
template <typename T>
inline bool Type::isA() const
{
return isA(GetType<T>());
}
//***************
// -- GetType --
//***************
/* Used to provide the implementation for GetType() */
template <class T>
struct GetTypeImpl
{
//If we have static_assert(), use it to show a more friendly error message to the developer.
//The check is dummy and is expected to evaluate to false. It is just used to trick the
//compiler to delay the evaluation of the expression until the instantiation of this template
//(where T becomes a known type). static_assert(false, "foo"); fails even before instantiation.
#if defined(QGLIB_HAVE_CXX0X_STATIC_ASSERT)
private:
template <class X> struct FailStruct { static const bool value = false; };
static_assert(FailStruct<T>::value, "Type T has not been registered with the QGlib type system");
#endif
};
/*! This template function retrieves the QGlib::Type (aka GType) of a given type T.
* \relates QGlib::Type
*/
template <class T>
inline Type GetType()
{
return GetTypeImpl<T>();
}
} //namespace QGlib
/* This is to be used to define new Q*_REGISTER_TYPE(T) macros in
* other bindings libraries that are based on QtGLib.
*/
#define QGLIB_REGISTER_TYPE_WITH_EXPORT_MACRO(T, EXPORT_MACRO) \
namespace QGlib { \
template <> \
struct EXPORT_MACRO GetTypeImpl<T> { operator Type(); }; \
}
/* This macro is used to register a class with the QtGLib type system. It forward-declares
* a specialization for struct GetTypeImpl and serves as a keyword for codegen,
* our code generator, which provides the compiled implementation. This specific macro
* is meant to be used only inside QtGLib, for other libraries, define a new macro
* using QGLIB_REGISTER_TYPE_WITH_EXPORT_MACRO.
* Note: this macro must be used outside of any namespace scope
*/
#define QGLIB_REGISTER_TYPE(T) \
QGLIB_REGISTER_TYPE_WITH_EXPORT_MACRO(T, QTGLIB_EXPORT)
//**************************
// -- type registrations --
//**************************
#define QGLIB_REGISTER_NATIVE_TYPE(T, GTYPE) \
namespace QGlib { \
template <> \
struct GetTypeImpl<T> { \
inline operator Type() { return (GTYPE); }; \
}; \
}
QGLIB_REGISTER_NATIVE_TYPE(bool, Type::Boolean)
QGLIB_REGISTER_NATIVE_TYPE(char, Type::Char)
QGLIB_REGISTER_NATIVE_TYPE(unsigned char, Type::Uchar)
QGLIB_REGISTER_NATIVE_TYPE(int, Type::Int)
QGLIB_REGISTER_NATIVE_TYPE(unsigned int, Type::Uint)
QGLIB_REGISTER_NATIVE_TYPE(long, Type::Long)
QGLIB_REGISTER_NATIVE_TYPE(unsigned long, Type::Ulong)
QGLIB_REGISTER_NATIVE_TYPE(qint64, Type::Int64)
QGLIB_REGISTER_NATIVE_TYPE(quint64, Type::Uint64)
QGLIB_REGISTER_NATIVE_TYPE(float, Type::Float)
QGLIB_REGISTER_NATIVE_TYPE(double, Type::Double)
QGLIB_REGISTER_NATIVE_TYPE(void*, Type::Pointer)
QGLIB_REGISTER_NATIVE_TYPE(const char*, Type::String)
QGLIB_REGISTER_NATIVE_TYPE(QByteArray, Type::String)
QGLIB_REGISTER_NATIVE_TYPE(QString, Type::String)
//partial specializations for string literals
namespace QGlib {
template <int N>
struct GetTypeImpl<const char[N]> { //ISO C++ string literals are const char[]
inline operator Type() { return Type::String; };
};
}
namespace QGlib {
template <int N>
struct GetTypeImpl<char[N]> { //gcc string literals are char[]
inline operator Type() { return Type::String; };
};
}
#undef QGLIB_REGISTER_NATIVE_TYPE
QGLIB_REGISTER_TYPE(QGlib::Type) //codegen: GType=G_TYPE_GTYPE
#endif // QGLIB_TYPE_H
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